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Questions and Answers
What method is used to select the top 2 records from a DataFrame?
How would you select records where the 'age' is greater than 18 in a DataFrame?
What function is used to add a new column in a DataFrame that sums values across specific columns?
Which method is used for sorting records in a DataFrame based on a specific column?
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How would you read a CSV file into a DataFrame using pandas?
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Which SQL query would you use to display student details who got the highest total marks?
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What action will the trigger 'trigger_name' perform?
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In the 'Student' table, what does the primary key 'sno' represent?
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What is the purpose of using the SELECT statement in SQL?
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What will the Python program do when listing out the top three records from a dataframe?
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What does the 'gross_salary' column represent in the 'Employee' table?
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When sorting a dataframe based on 'gross salary', what will be the impact on the order of records?
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Study Notes
Data Manipulation with Pandas
- To select the top 2 records from a DataFrame, use the
head()function. - To select records where the 'age' is greater than 18 in a DataFrame, use the conditional selection method
df[df['age'] > 18]. - To add a new column in a DataFrame that sums values across specific columns, use the
assign()function. - To sort records in a DataFrame based on a specific column, use the
sort_values()method.
Reading CSV Files with Pandas
- To read a CSV file into a DataFrame using pandas, use the
read_csv()function.
SQL Queries
- To display student details who got the highest total marks, use the SQL query
SELECT * FROM Student ORDER BY total_marks DESC LIMIT 1. - The
SELECTstatement in SQL is used to retrieve data from a database table.
Database Concepts
- In the 'Student' table, the primary key 'sno' represents a unique identifier for each student.
- The 'gross_salary' column in the 'Employee' table represents the total salary of an employee.
Data Sorting and Listing
- When sorting a dataframe based on 'gross salary', the order of records will be arranged in ascending or descending order based on the salary values.
- When listing out the top three records from a dataframe, the program will display the first three records in the sorted order.
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Description
Test your knowledge on selecting data from pandas DataFrames using head, tail, loc, and iloc methods. Practice selecting top and bottom records, specific conditions, and accessing specific data based on labels or positions.
